Physics (AS & A Level) · Feb / March 2020 · Paper 12 · Question 34

A manufacturer recommends that the longer the extension cord you use with an electric drill, the bigger the cross-sectional area of the cord should be. What is a reason for this recommendation?

1. AResistance is inversely proportional to both the length and the cross-sectional area.
2. BResistance is inversely proportional to the length and directly proportional to the cross-sectional area.
3. CResistance is proportional to both the length and the cross-sectional area.
4. DResistance is proportional to the length and inversely proportional to the cross-sectional area.

As printed in the paper